Published August 31, 2019 | Version v1
Journal article Open

DESIGNING A SYSTEM OF LIQUID COOLING FOR INDUSTRIAL MICROWAVE INSTALLATIONS

Creators

  • 1. V. S. Martynovsky Institute of Refrigeration, Cryotechnologies and Ecoenergetics Odessa National Academy of Food Technologies
  • 2. Odessa National Academy of Food Technologies
  • 3. Odessa Military Academy

Description

The paper considers the issue on ensuring a thermal regime of the magnetron's anode unit by replacing an air-cooling system with the system of liquid cooling. It has been argued that a liquid cooling system is most suitable for magnetrons, for which currently an air-cooling system is implied, although they are not designed for a continuous operation in the structure of industrial microwave installations. Arranging the system of liquid cooling would makes it possible for a magnetron to work over long time without overheating and under favorable conditions, which rule out a possibility to clog the heat exchange surface with particles and dust, as well as the occurrence of overheating of the anode unit's surface. The basic element of the proposed system for liquid cooling is a cooling jacket, which represents an annular channel made from a heat-conducting material. Cooling jacket is mounted directly on the anode unit; in this case, a compression ratio of surfaces and the thickness of an air gap must ensure a minimum total thermal resistance. In order to determine heat transfer coefficients, an empirical dependence was established, which reflects the fact that when cooling the anode units the rational regimes are the viscous and transitional motion modes. The basic thermal characteristics of the cooling process have been defined, which include a coefficient of heat transfer, change in a heat-carrier temperature, the maximally permissible temperature at inlet. Calculations were carried out for two types of heat-carriers: water and a 54 % aqueous solution of ethylene glycol. A circuit for the system of liquid cooling has been proposed, which implies cooling from 1 to 6 magnetrons. Applying a given circuitry and choosing the rational estimated modes make it possible to solve the task on improving production efficiency, as well as reliability of microwave equipment.

Files

Designing a system of liquid cooling for industrial microwave installations.pdf

Files (400.1 kB)

Additional details

References

  • Okeke, C., Abioye, A. E., Omosun, Y. (2014). Microwave heating application in food processing. IOSR Journal of Electrical and Electronics Engineering, 9 (4), 29–34.
  • Bykov, Y. V., Egorov, S. V., Eremeev, A. G., Plotnikov, I. V., Rybakov, K. I., Semenov, V. E. et. al. (2012). Fabrication of metal-ceramic functionally graded materials by microwave sintering. Inorganic Materials: Applied Research, 3 (3), 261–269. doi: https://doi.org/10.1134/s2075113312030057
  • El-Naggar, S. M., Mikhaiel, A. A. (2011). Disinfestation of stored wheat grain and flour using gamma rays and microwave heating. Journal of Stored Products Research, 47 (3), 191–196. doi: https://doi.org/10.1016/j.jspr.2010.11.004
  • Puligundla, P. (2013). Potentials of Microwave Heating Technology for Select Food Processing Applications - a Brief Overview and Update. Journal of Food Processing & Technology, 04 (11). doi: https://doi.org/10.4172/2157-7110.1000278
  • Burdo, O. G., Syrotyuk, I. V., Alhury, U., Levtrinska, J.O. (2016). Microwave Energy, as an Intensification Factor in the Heat-Mass Transfer and the Polydisperse Extract Formation. Problemele energeticii regionale, 1 (36), 59–71.
  • Mujumdar, A. S. (Ed.) (2014). Handbook of Industrial Drying. CRC Press, 1348. doi: https://doi.org/10.1201/b17208
  • Tikhonov, V. N., Ivanov, I. A., Kryukov, A. E., Tikhonov, A. V. (2015). Low cost microwave generators for plasma torches. Prikladnaya fizika, 5, 102–106.
  • Pozar, D. M. (2012). Microwave Engineering. Wiley, 756.
  • Bole, A., Wall, A., Norris, A. (2014). The Radar System – Technical Principles. Radar and ARPA Manual, 29–137. doi: https://doi.org/10.1016/b978-0-08-097752-2.00002-7
  • Azarenkov, B. I., Kutsenko, A. S. (2013). Metodika i algoritm inzhenernogo rascheta temperaturnogo rezhima radioehlektronnoy apparatury. Visnyk natsionalnoho tekhnichnoho universytetu KhPI, 2 (976), 22–29.
  • Churyumov, G. I., Ehkezli, A. I. (2012). Modelirovanie chastotnyh harakteristik magnetrona s dvumya vyvodami ehnergii. Prikladnaya radioehlektronika, 11 (1), 63–71.
  • Lee, Y.-S., Lee, J.-S. (2003). A study on the cooling system of low power magnetron by using the natural convection heat transfer. 4th IEEE International Conference on Vacuum Electronics, 2003. doi: https://doi.org/10.1109/ivec.2003.1286123
  • Park, D. H., Seo, E. R., Kwon, M. K., Lee, C. S. (2019). A study on thermal fluid flow of magnetron cooling for microwave oven. Journal of Mechanical Science and Technology, 33 (4), 1915–1923. doi: https://doi.org/10.1007/s12206-019-0342-x
  • Aleksandrenkov, V. P. (2012). Issledovanie ehffektivnosti intensifikatsii teplootdachi v kol'tsevom kanale pri tsentral'nom teplopodvode. Vestnik MGTU im. N. Eh. Baumana. Ser.: Mashinostroenie, 4, 43–50.
  • Boltenko, E. A., Varava, A. N., Dedov, A. V., Zakharenkov, A. V., Komov, A. T., Malakhovskii, S. A. (2015). Investigation of heat transfer and pressure drop in an annular channel with heat transfer intensifiers. Thermal Engineering, 62 (3), 177–182. doi: https://doi.org/10.1134/s0040363615030017
  • Dirker, J., Meyer, J. P. (2005). Convective Heat Transfer Coefficients in Concentric Annuli. Heat Transfer Engineering, 26 (2), 38–44. doi: https://doi.org/10.1080/01457630590897097